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<em>Correction to your question text: diameter, not radius.</em>
The area of a circle is given by:

The radius is half of the diameter.

Substitute and solve.

Answer:
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what is the question?
Answer:
No it is not statistical
Step-by-step explanation:
It would be statistical if the answers varied which in this case they don't because there is a certain amount of people that passed and the answers do not vary. However, asking what was your score is statistical because answers will vary.
Answer:
Fourth root of 256 is ±4.
hope this helps